Re: [PATCH v2 6/8] scsi: ufs: make the UFS variant a platform device

From: ygardi
Date: Mon Aug 24 2015 - 04:32:35 EST

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> O
> n Aug 20, 2015 6:59 AM, "Yaniv Gardi" <ygardi@xxxxxxxxxxxxxx> wrote:
>>
>> This change turns the UFS variant (SCSI_UFS_QCOM) into a UFS
>> a platform device.
>> In order to do so a few additional changes are required:
>> 1. The ufshcd-pltfrm is no longer serves as a platform device.
>> Now it only serves as a group of platform APIs such as PM APIs
>> (runtime suspend/resume, system suspend/resume etc), parsers of
>> clocks, regulators and pm_levels from DT.
>> 2. What used to be the old platform "probe" is now "only" a
>> pltfrm_init()
>> routine, that does exactly the same, but only being called by the
>> new probe function of the UFS variant.
>>
>> Signed-off-by: Yaniv Gardi <ygardi@xxxxxxxxxxxxxx>
>>
>> ---
>> drivers/scsi/ufs/ufs-qcom.c | 83
>> +++++++++++++++++++++++++++++++++++-
>> drivers/scsi/ufs/ufshcd-pltfrm.c | 92
>> ++++++++++------------------------------
>> drivers/scsi/ufs/ufshcd-pltfrm.h | 41 ++++++++++++++++++
>> drivers/scsi/ufs/ufshcd.c | 10 +++++
>> drivers/scsi/ufs/ufshcd.h | 1 +
>> 5 files changed, 156 insertions(+), 71 deletions(-)
>> create mode 100644 drivers/scsi/ufs/ufshcd-pltfrm.h
>>
>> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
>> index 329ac84..725cd49 100644
>> --- a/drivers/scsi/ufs/ufs-qcom.c
>> +++ b/drivers/scsi/ufs/ufs-qcom.c
>> @@ -19,6 +19,7 @@
>>
>> #include <linux/phy/phy-qcom-ufs.h>
>> #include "ufshcd.h"
>> +#include "ufshcd-pltfrm.h"
>> #include "unipro.h"
>> #include "ufs-qcom.h"
>> #include "ufshci.h"
>> @@ -1036,7 +1037,7 @@ void ufs_qcom_clk_scale_notify(struct ufs_hba
>> *hba)
>> * The variant operations configure the necessary controller and PHY
>> * handshake during initialization.
>> */
>> -static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
>> +static struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
>> .name = "qcom",
>> .init = ufs_qcom_init,
>> .exit = ufs_qcom_exit,
>> @@ -1050,4 +1051,84 @@ static const struct ufs_hba_variant_ops
>> ufs_hba_qcom_vops = {
>> .resume = ufs_qcom_resume,
>> };
>>
>> +/**
>> + * ufs_qcom_probe - probe routine of the driver
>> + * @pdev: pointer to Platform device handle
>> + *
>> + * Always return 0
>> + */
>> +static int ufs_qcom_probe(struct platform_device *pdev)
>> +{
>> + int err;
>> + struct device *dev = &pdev->dev;
>> + struct ufs_hba *hba;
>> +
>> + /* Perform generic probe */
>> + err = ufshcd_pltfrm_init(pdev, &ufs_hba_qcom_vops);
>> + if (err) {
>> + dev_err(dev, "ufshcd_pltfrm_init() failed %d\n", err);
>> + goto out;
>> + }
>> +
>> + hba = platform_get_drvdata(pdev);
>> + if (unlikely(!hba)) {
>
> Shouldn't this condition be caught by init above?

actually yes, it should.

>
>> + dev_err(dev, "no hba structure after successful
>> probing\n");
>> + goto dealloc_host;
>> + }
>> +
>> + return 0;
>> +
>> +dealloc_host:
>> + /* disconnect the bind between the qcom host and the hba */
>> + ufshcd_set_variant(hba, NULL);
>> + ufshcd_dealloc_host(hba);
>> +out:
>> + return err;
>> +}
>> +
>> +/**
>> + * ufs_qcom_remove - set driver_data of the device to NULL
>> + * @pdev: pointer to platform device handle
>> + *
>> + * Always return 0
>> + */
>> +static int ufs_qcom_remove(struct platform_device *pdev)
>> +{
>> + struct ufs_hba *hba = platform_get_drvdata(pdev);
>> +
>> + pm_runtime_get_sync(&(pdev)->dev);
>> + ufshcd_remove(hba);
>> + return 0;
>> +}
>> +
>> +static void ufs_qcom_shutdown(struct platform_device *pdev)
>> +{
>> + ufshcd_shutdown((struct ufs_hba *)platform_get_drvdata(pdev));
>> +}
>> +
>> +static const struct of_device_id ufs_qcom_of_match[] = {
>> + { .compatible = "qcom,ufshc"},
>
> Is this documented?

in V3 it is documented. thanks
>
>> + {},
>> +};
>> +
>> +static const struct dev_pm_ops ufs_qcom_pm_ops = {
>> + .suspend = ufshcd_pltfrm_suspend,
>> + .resume = ufshcd_pltfrm_resume,
>> + .runtime_suspend = ufshcd_pltfrm_runtime_suspend,
>> + .runtime_resume = ufshcd_pltfrm_runtime_resume,
>> + .runtime_idle = ufshcd_pltfrm_runtime_idle,
>> +};
>> +
>> +static struct platform_driver ufs_qcom_pltform = {
>> + .probe = ufs_qcom_probe,
>> + .remove = ufs_qcom_remove,
>> + .shutdown = ufs_qcom_shutdown,
>> + .driver = {
>> + .name = "ufshcd-qcom",
>> + .pm = &ufs_qcom_pm_ops,
>> + .of_match_table = of_match_ptr(ufs_qcom_of_match),
>> + },
>> +};
>> +module_platform_driver(ufs_qcom_pltform);
>> +
>> MODULE_LICENSE("GPL v2");
>> diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c
>> b/drivers/scsi/ufs/ufshcd-pltfrm.c
>> index 7db9564..91c73934 100644
>> --- a/drivers/scsi/ufs/ufshcd-pltfrm.c
>> +++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
>> @@ -38,20 +38,7 @@
>> #include <linux/of.h>
>>
>> #include "ufshcd.h"
>> -
>> -static const struct of_device_id ufs_of_match[];
>> -static struct ufs_hba_variant_ops *get_variant_ops(struct device *dev)
>> -{
>> - if (dev->of_node) {
>> - const struct of_device_id *match;
>> -
>> - match = of_match_node(ufs_of_match, dev->of_node);
>> - if (match)
>> - return (struct ufs_hba_variant_ops
>> *)match->data;
>> - }
>> -
>> - return NULL;
>> -}
>> +#include "ufshcd-pltfrm.h"
>>
>> static int ufshcd_parse_clock_info(struct ufs_hba *hba)
>> {
>> @@ -245,10 +232,11 @@ out:
>> * Returns 0 if successful
>> * Returns non-zero otherwise
>> */
>> -static int ufshcd_pltfrm_suspend(struct device *dev)
>> +int ufshcd_pltfrm_suspend(struct device *dev)
>> {
>> return ufshcd_system_suspend(dev_get_drvdata(dev));
>> }
>> +EXPORT_SYMBOL_GPL(ufshcd_pltfrm_suspend);
>>
>> /**
>> * ufshcd_pltfrm_resume - resume power management function
>> @@ -257,43 +245,47 @@ static int ufshcd_pltfrm_suspend(struct device
>> *dev)
>> * Returns 0 if successful
>> * Returns non-zero otherwise
>> */
>> -static int ufshcd_pltfrm_resume(struct device *dev)
>> +int ufshcd_pltfrm_resume(struct device *dev)
>> {
>> return ufshcd_system_resume(dev_get_drvdata(dev));
>> }
>> +EXPORT_SYMBOL_GPL(ufshcd_pltfrm_resume);
>>
>> -static int ufshcd_pltfrm_runtime_suspend(struct device *dev)
>> +int ufshcd_pltfrm_runtime_suspend(struct device *dev)
>> {
>> return ufshcd_runtime_suspend(dev_get_drvdata(dev));
>> }
>> -static int ufshcd_pltfrm_runtime_resume(struct device *dev)
>> +EXPORT_SYMBOL_GPL(ufshcd_pltfrm_runtime_suspend);
>> +
>> +int ufshcd_pltfrm_runtime_resume(struct device *dev)
>> {
>> return ufshcd_runtime_resume(dev_get_drvdata(dev));
>> }
>> -static int ufshcd_pltfrm_runtime_idle(struct device *dev)
>> +EXPORT_SYMBOL_GPL(ufshcd_pltfrm_runtime_resume);
>> +
>> +int ufshcd_pltfrm_runtime_idle(struct device *dev)
>> {
>> return ufshcd_runtime_idle(dev_get_drvdata(dev));
>> }
>> -#else /* !CONFIG_PM */
>> -#define ufshcd_pltfrm_suspend NULL
>> -#define ufshcd_pltfrm_resume NULL
>> -#define ufshcd_pltfrm_runtime_suspend NULL
>> -#define ufshcd_pltfrm_runtime_resume NULL
>> -#define ufshcd_pltfrm_runtime_idle NULL
>> +EXPORT_SYMBOL_GPL(ufshcd_pltfrm_runtime_idle);
>> +
>> #endif /* CONFIG_PM */
>>
>> -static void ufshcd_pltfrm_shutdown(struct platform_device *pdev)
>> +void ufshcd_pltfrm_shutdown(struct platform_device *pdev)
>> {
>> - ufshcd_shutdown((struct ufs_hba *)platform_get_drvdata(pdev));
>> + ufshcd_shutdown((struct ufs_hba *)platform_get_drvdata(pdev));
>> }
>> +EXPORT_SYMBOL_GPL(ufshcd_pltfrm_shutdown);
>>
>> /**
>> * ufshcd_pltfrm_probe - probe routine of the driver
>
> Needs updating.

in V3 it is updated. thanks

>
>> * @pdev: pointer to Platform device handle
>> + * @vops: pointer to variant ops
>> *
>> * Returns 0 on success, non-zero value on failure
>> */
>> -static int ufshcd_pltfrm_probe(struct platform_device *pdev)
>> +int ufshcd_pltfrm_init(struct platform_device *pdev,
>> + struct ufs_hba_variant_ops *vops)
>> {
>> struct ufs_hba *hba;
>> void __iomem *mmio_base;
>> @@ -321,7 +313,7 @@ static int ufshcd_pltfrm_probe(struct
>> platform_device *pdev)
>> goto out;
>> }
>>
>> - hba->vops = get_variant_ops(&pdev->dev);
>> + hba->vops = vops;
>>
>> err = ufshcd_parse_clock_info(hba);
>> if (err) {
>> @@ -355,47 +347,7 @@ out_disable_rpm:
>> out:
>> return err;
>> }
>> -
>> -/**
>> - * ufshcd_pltfrm_remove - remove platform driver routine
>> - * @pdev: pointer to platform device handle
>> - *
>> - * Returns 0 on success, non-zero value on failure
>> - */
>> -static int ufshcd_pltfrm_remove(struct platform_device *pdev)
>> -{
>> - struct ufs_hba *hba = platform_get_drvdata(pdev);
>> -
>> - pm_runtime_get_sync(&(pdev)->dev);
>> - ufshcd_remove(hba);
>> - return 0;
>> -}
>> -
>> -static const struct of_device_id ufs_of_match[] = {
>> - { .compatible = "jedec,ufs-1.1"},
>> - {},
>> -};
>> -
>> -static const struct dev_pm_ops ufshcd_dev_pm_ops = {
>> - .suspend = ufshcd_pltfrm_suspend,
>> - .resume = ufshcd_pltfrm_resume,
>> - .runtime_suspend = ufshcd_pltfrm_runtime_suspend,
>> - .runtime_resume = ufshcd_pltfrm_runtime_resume,
>> - .runtime_idle = ufshcd_pltfrm_runtime_idle,
>> -};
>> -
>> -static struct platform_driver ufshcd_pltfrm_driver = {
>> - .probe = ufshcd_pltfrm_probe,
>> - .remove = ufshcd_pltfrm_remove,
>> - .shutdown = ufshcd_pltfrm_shutdown,
>> - .driver = {
>> - .name = "ufshcd",
>> - .pm = &ufshcd_dev_pm_ops,
>> - .of_match_table = ufs_of_match,
>> - },
>> -};
>> -
>> -module_platform_driver(ufshcd_pltfrm_driver);
>> +EXPORT_SYMBOL_GPL(ufshcd_pltfrm_init);
>>
>> MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@xxxxxxxxxxx>");
>> MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@xxxxxxxxxxx>");
>> diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.h
>> b/drivers/scsi/ufs/ufshcd-pltfrm.h
>> new file mode 100644
>> index 0000000..df64c41
>> --- /dev/null
>> +++ b/drivers/scsi/ufs/ufshcd-pltfrm.h
>> @@ -0,0 +1,41 @@
>> +/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 and
>> + * only version 2 as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + */
>> +
>> +#ifndef UFSHCD_PLTFRM_H_
>> +#define UFSHCD_PLTFRM_H_
>> +
>> +#include "ufshcd.h"
>> +
>> +int ufshcd_pltfrm_init(struct platform_device *pdev,
>> + struct ufs_hba_variant_ops *vops);
>> +void ufshcd_pltfrm_shutdown(struct platform_device *pdev);
>> +
>> +#ifdef CONFIG_PM
>> +
>> +int ufshcd_pltfrm_suspend(struct device *dev);
>> +int ufshcd_pltfrm_resume(struct device *dev);
>> +int ufshcd_pltfrm_runtime_suspend(struct device *dev);
>> +int ufshcd_pltfrm_runtime_resume(struct device *dev);
>> +int ufshcd_pltfrm_runtime_idle(struct device *dev);
>> +
>> +#else /* !CONFIG_PM */
>> +
>> +#define ufshcd_pltfrm_suspend NULL
>> +#define ufshcd_pltfrm_resume NULL
>> +#define ufshcd_pltfrm_runtime_suspend NULL
>> +#define ufshcd_pltfrm_runtime_resume NULL
>> +#define ufshcd_pltfrm_runtime_idle NULL
>> +
>> +#endif /* CONFIG_PM */
>> +
>> +#endif /* UFSHCD_PLTFRM_H_ */
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index 9e79c33..2ef9834 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -5348,6 +5348,16 @@ void ufshcd_remove(struct ufs_hba *hba)
>> EXPORT_SYMBOL_GPL(ufshcd_remove);
>>
>> /**
>> + * ufshcd_dealloc_host - deallocate Host Bus Adapter (HBA)
>> + * @hba: pointer to Host Bus Adapter (HBA)
>> + */
>> +void ufshcd_dealloc_host(struct ufs_hba *hba)
>> +{
>> + scsi_host_put(hba->host);
>> +}
>> +EXPORT_SYMBOL_GPL(ufshcd_dealloc_host);
>> +
>> +/**
>> * ufshcd_set_dma_mask - Set dma mask based on the controller
>> * addressing capability
>> * @hba: per adapter instance
>> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
>> index ce75626..f2aa47e 100644
>> --- a/drivers/scsi/ufs/ufshcd.h
>> +++ b/drivers/scsi/ufs/ufshcd.h
>> @@ -576,6 +576,7 @@ static inline void ufshcd_rmwl(struct ufs_hba *hba,
>> u32 mask, u32 val, u32 reg)
>> }
>>
>> int ufshcd_alloc_host(struct device *, struct ufs_hba **);
>> +void ufshcd_dealloc_host(struct ufs_hba *);
>> int ufshcd_init(struct ufs_hba * , void __iomem * , unsigned int);
>> void ufshcd_remove(struct ufs_hba *);
>>
>> --
>> 1.8.5.2
>>
>> --
>> QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a
>> member of Code Aurora Forum, hosted by The Linux Foundation
> --
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Next message: Jason Wang: "[PATCH net-next] macvtap/macvlan: use IFF_NO_QUEUE"
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